Regularity of Menstrual Cycle: What You Need to Know

The regularity of the menstrual cycle is an important indicator of a woman’s health. However, menstrual periods do not always occur on the exact same day each month. Let’s explore what fluctuations are considered normal, what they depend on, and when you should consult a doctor.

Normal Fluctuations in the Menstrual Cycle

Many women believe that menstruation should start on the exact same day every month. In reality, this is not the case. Permissible fluctuations depend on age:

• Ages 25–41: A fluctuation of up to 7 days is considered normal. For example, if one month your cycle is 26 days, the next month 27 days, and then 26 days again, this is acceptable.
• Under 25 and over 40: In these age groups, the cycle may fluctuate by up to 9 days due to hormonal changes.
• Adolescent years: In the first few years after menstruation begins, delays of up to 3 months are normal until the cycle becomes regular.
• Perimenopausal period: Women nearing menopause may experience even larger delays due to hormonal changes associated with this transition.

When Do Fluctuations Indicate a Problem?

It’s important to remember that minor changes (1–2 days) in the cycle are not a cause for concern. However, you should consult a doctor if:

• The delay lasts more than 10 days if the cycle has previously been regular.
• The cycle is too short (less than 21 days) or too long (more than 35 days).
• There are sudden changes in cycle length without clear reason.
• There are associated symptoms: severe pain, heavy or very light bleeding.

How to Track the Regularity of Your Cycle?

To monitor your cycle, you can use dedicated mobile apps or a traditional calendar. Record the start and end dates of menstruation and note any unusual symptoms. This information will help your doctor more quickly determine possible causes of irregularities.

Conclusion

The regularity of the menstrual cycle can vary depending on age and individual factors. Minor fluctuations are normal. The key is to pay attention to how you feel and consult a doctor if you have any concerns.

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